ARM I: Patients receive cediranib maleate orally (PO) once daily (QD) for 3 days. Patients then undergo radiation therapy (intensity-modulated radiation therapy or 3-dimensional conformal radiation therapy) QD, 5 days a week, for 6 weeks and receive temozolomide PO QD and cediranib maleate PO QD for 6 weeks. Patients then receive temozolomide PO QD alone on days 1-5. Treatment with temozolomide repeats every 28 days for up to 12 courses in the absence of disease progression or unacceptable toxicity.